Methods for converting between the physics world coordinates and the screen coordinates. : Screen « Hardware « Android

1. Android
2. Hardware
3. Screen

Methods for converting between the physics world coordinates and the screen coordinates.

   

/*
 * Copyright (C) 2010 Adam Nyb?ck
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

//package se.anyro.breakin;

import android.graphics.Point;

/**
 * Methods for converting between the physics world coordinates and the screen coordinates.
 * Note! setScreenSize has to be called before the other methods are used.
 */
class SizeUtil {
  private static int screenWidth = 320;
  private static int screenHeight = 480;
  private static int halfWidth = screenWidth / 2;
  private static int halfHeight = screenHeight / 2;
  private static float scale = 16;
  
  public static void setScreenSize(int width, int height) {
    screenWidth = width;
    screenHeight = height;
    
    halfWidth = width / 2;
    halfHeight = height / 2;
    
    // Scale to maximum height/width depending on the ratio
      if (width * 3 > height * 2) {
        scale = (float) height / 200;
      } else {
        scale = (float) width / 200;
      }
  }
  
  public static int getScreenWidth() {
    return screenWidth;
  }
  
  public static int getScreenHeight() {
    return screenHeight;
  }
  
  public static void toScreen(float worldX, float worldY, Point screen) {
    screen.x = halfWidth + (int) (worldX * scale);
    screen.y = halfHeight - (int) (worldY * scale);
  }
  
  public static int toScreen(float worldLen) {
    return (int) (worldLen * scale);
  }

  public static float fromScreen(int screenLen) {
    return screenLen / scale;
  }
}

   
    
    
  

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